US6908982B2 - Amino composition and process for producing the same - Google Patents

Amino composition and process for producing the same Download PDF

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US6908982B2
US6908982B2 US10/463,594 US46359403A US6908982B2 US 6908982 B2 US6908982 B2 US 6908982B2 US 46359403 A US46359403 A US 46359403A US 6908982 B2 US6908982 B2 US 6908982B2
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epoxy resin
amino
composition
diamine
composition according
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US20040044176A1 (en
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Tetsushi Ichikawa
Hisayuki Kuwahara
Masatoshi Echigo
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Mitsubishi Gas Chemical Co Inc
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
    • C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
    • C08G59/50—Amines
    • C08G59/5026—Amines cycloaliphatic
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
    • C07C209/60—Preparation of compounds containing amino groups bound to a carbon skeleton by condensation or addition reactions, e.g. Mannich reaction, addition of ammonia or amines to alkenes or to alkynes or addition of compounds containing an active hydrogen atom to Schiff's bases, quinone imines, or aziranes
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C211/00—Compounds containing amino groups bound to a carbon skeleton
    • C07C211/01—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to acyclic carbon atoms
    • C07C211/16—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to acyclic carbon atoms of a saturated carbon skeleton containing rings other than six-membered aromatic rings
    • C07C211/18—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to acyclic carbon atoms of a saturated carbon skeleton containing rings other than six-membered aromatic rings containing at least two amino groups bound to the carbon skeleton
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C211/00—Compounds containing amino groups bound to a carbon skeleton
    • C07C211/01—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to acyclic carbon atoms
    • C07C211/26—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to acyclic carbon atoms of an unsaturated carbon skeleton containing at least one six-membered aromatic ring
    • C07C211/27—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to acyclic carbon atoms of an unsaturated carbon skeleton containing at least one six-membered aromatic ring having amino groups linked to the six-membered aromatic ring by saturated carbon chains
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
    • C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
    • C08G59/50—Amines
    • C08G59/5033—Amines aromatic
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2601/00—Systems containing only non-condensed rings
    • C07C2601/12—Systems containing only non-condensed rings with a six-membered ring
    • C07C2601/14—The ring being saturated

Definitions

  • the present invention relates to an amino composition containing a certain amino compound as a main component, a process for producing the same and the use thereof.
  • the amino composition when it is used as a curing agent for epoxy resin, provides a long pot life and an excellent appearance of a coating film to an epoxy resin composition without deteriorating its reactivity. Therefore, this amino composition is applicable to a curing agent for epoxy resin and a raw material thereof to be utilized in the field using epoxy resin including use as a coating material, use as a material for civil engineering and construction, use as an adhesive, use as a material for electricity and electronics, and use as a composite material. Further, this amino composition is applicable to a chain extender for polyurethane resin and a raw material thereof to be utilized in a field using polyurethane resin including use as foam, elastomer, coating adhesive, fiber, heather and water proof material.
  • Room temperature curing epoxy resin composition using these curing agent for epoxy resin are particularly utilized widely in a field of coating material such as a corrosion-resistant paint for ship, bridge and land and marine iron structure, and a field of civil engineering and construction such as lining, reinforcement and repair of concrete structure, a flooring material of building, lining of water supplying facility and sewerage, pavior, and adhesive material.
  • a field of coating material such as a corrosion-resistant paint for ship, bridge and land and marine iron structure
  • a field of civil engineering and construction such as lining, reinforcement and repair of concrete structure, a flooring material of building, lining of water supplying facility and sewerage, pavior, and adhesive material.
  • amino compounds are as follows: aliphatic polyamino compound such as ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, hexamethylenediamine; aliphatic polyamino compound having aromatic ring such as xylylenediamine; alicyclic polyamino compound such as menthenediamine, isophoronediamine, bis(aminomethyl)cyclohexane, N-aminomethylpiperazine; aromatic polyamino compound such as phenylenediamine, diaminodiphenylmethane, diaminodiphenylsulfone; other polyamino compounds such as polyamino compound having polyether framework, polyamino compound having norbornane framework. These polyamino compounds have their own characteristic features respectively caused by the reactivity of their amino groups, namely their active hydrogen. Therefore, these polyamino compounds are used as a curing agent for epoxy
  • a diamine represented by the formula (1) or a curing agent for epoxy resin using the diamine as a raw material have a feature that they are suitable for curing at relatively low temperature, since their reactivity with an epoxy resin is higher and the curing speed of an epoxy resin composition is faster than other polyamino compounds or a curing agent for epoxy resin using the same as a raw material. Further, they have features to provide an excellent curing property of an epoxy resin composition, an excellent performance of cured coating film of epoxy resin, an excellent physical property of an epoxy resin cured product and an excellent adhesion property of an epoxy resin cured product and the like. Especially, when used as a coating material, they have features to provide a coating film excellent in both gloss and leveling and a cured product excellent in both water resistance and chemical resistance.
  • an epoxy resin composition using a diamine represented by the formula (1) or a curing agent for epoxy resin using the diamine as a raw material has defects that it exhibits a short pot life and its workability is inferior when it is cured at room temperature. Further, it has defect that a performance of cured coating film of epoxy resin or a physical property and an adhesion property of an epoxy resin cured product occasionally deteriorates because such epoxy resin composition easily produces carbamate or carbonate by absorbing carbon dioxide or water vapor in the atmosphere. Particularly, it has defects that the appearance of a coating film tends to be inferior by the phenomena of whitening or stickiness.
  • An object of the present invention is to provide an amino composition which provides, when used as a curing agent for epoxy resin, a long pot life and an excellent appearance of a coating film to an epoxy resin composition without deteriorating the reactivity of the composition, and a process for producing the same.
  • Another object of the present invention is to provide a curing agent for epoxy resin which provides an excellent performance of cured coating film of epoxy resin, an excellent physical property of an epoxy resin cured product and an excellent adhesion property of an epoxy resin cured product, to provide an epoxy resin composition containing the curing agent, and to provide an epoxy resin cured coating film and an epoxy resin cured product obtained by curing the epoxy resin composition, which are suitable for a use as a coating material and a material for civil engineering and construction.
  • an amino composition obtained by addition reaction of the diamine represented by the formula (1) and styrene in which a particular amino compound that is an addition product out of several kinds of addition products having different number of addition molecules and different addition structure is comprised in the certain ratio and the content of the unreacted diamine represented by the formula (1) is below a certain amount provides a long pot life and an excellent appearance of a coating film to an epoxy resin composition without deteriorating the reactivity of the composition when it is used as a curing agent for epoxy resin, and further provides an excellent performance of cured coating film of epoxy resin, an excellent physical property of an epoxy resin cured product and an excellent adhesion property of an epoxy resin cured product and is suitable for a use as an epoxy resin coating material and a material for civil engineering and construction, and have accomplished the present invention.
  • the present invention provides an amino composition described in the following 1)-2), a process for producing an amino composition described in 3), a curing agent for epoxy resin described in 4), an epoxy resin composition described in 5)-7), and an epoxy resin cured product described in 8).
  • the amino composition of the present invention is obtained by addition reaction of the diamine represented by the formula (1) with styrene and comprises at least one amino compound selected from the group of amino compounds represented by the formula (2) as a main component.
  • the group of amino compounds represented by the formula (2) is consisted of an addition product wherein R1, R2, and R3 are all hydrogen (1-addition product), an addition product wherein any two of R1-R3 are hydrogen and one is a phenethyl group (2-addition product), an addition product wherein any two of R1-R3 are phenethyl groups and one is hydrogen (3-addition product), and an addition product wherein R1, R2, and R3 are all phenethyl groups (4-addition product).
  • the amino compound(s) contained in the amino composition of the present invention is(are) selected from the above group of amino compounds.
  • Example of diamine represented by the formula (1) to be used in the present invention include orthoxylylenediamine, metaxylylenediamine, paraxylylenediamine, 1,2-bis(aminomethyl)cyclohexane, 1,3-bis(aminomethyl)cyclohexane, and 1,4-bis(aminomethyl)cyclohexane, among which metaxylylenediamine and 1,3-bis(aminomethyl)cyclohexane are particularly preferable. Each of them may be used individually or plural of them may be used.
  • other polyamino compounds may be mixed to the diamine represented by the formula (1).
  • the amount of other polyamino compounds to be mixed is larger than the amount of diamine represented by the formula (1), the features of the amino composition of the present invention using diamine represented by the formula (1) to provide an epoxy resin cured coating film excellent in both gloss and leveling and to provide a cured product excellent in both water resistance and chemical resistance cannot be maintained. Therefore, it is preferable that the amount of other polyamino compounds is 1 part by weight or below per 1 part by weight of diamine represented by the formula (1).
  • Examples of other polyamino compound to be mixed with diamine represented by the formula (1) include aliphatic polyamines such as ethylenediamine, diethylenetriamine, triethylenetetramine, hexamethylenediamine and polyoxyalkylenepolyamine; alicyclic polyamines such as isophoronediamine, norbornanediamine, 1,4-diaminocyclohexane and di(aminohexyl)methane; aromatic polyamines such as metaphenylenediamine, diaminodiphenylmethane and diaminodiphenylsulfone and heterocyclc polyamines such as N-aminoethylpiperazine and 3,9-bis(3-aminopropyl)-2,4,8,10-tetraoxaspiro[5,5]undecane.
  • aliphatic polyamines such as ethylenediamine, diethylenetriamine, triethylenetetramine, hexamethylenediamine and polyoxy
  • the amino compound of the present invention is a compound or the mixture of compounds selected from the group of the amino compounds represented by the formula (2). Since the amino composition of the present invention is obtained by addition reaction of the above-mentioned diamine and styrene, it usually is a mixture which contains unreacted diamine represented by the formula (1) and the like other than the amino compound(s) selected from the group of the amino compounds represented by the formula (2).
  • the content of diamine represented by the formula (1) in the amino composition is less than 15% by weight, preferably less than 5% by weight, more preferably less than 2% by weight based upon the total weight of the amino composition. The lower limits of the content of diamine is not limited.
  • the content of the addition product wherein R1, R2, and R3 are all hydrogen (1-addition product) is 50 to 100% by weight, preferably 60 to 100% by weight based upon the total weight of the amino compound(s) selected from the group of the amino compounds represented by the formula (2).
  • the preferable higher limit of the proportion of 1-addition product based upon the total weight of the amino compound(s) selected from the group of the amino compounds represented by the formula (2) is not limited.
  • an amino composition of the present invention it is preferable to carry out addition reaction of diamine represented by the formula (1) and styrene by adjusting the reaction mole ratio of styrene and diamine (styrene/diamine) in the range of 0.25 to 1.75. Less than 0.25 of the reaction mole ratio is unfavorable because the content of unreacted diamine in the amino composition is increased and it becomes difficult to remove the unreacted diamine by extraction or it takes time to remove the unreacted diamine by distillation.
  • More than 1.75 of the reaction mole ratio is unfavorable because the content of 1-addition product in which R1, R2, and R3 are all hydrogen easily becomes less than 50% by weight based upon the total weight of the amino compounds represented by the formula (2) and the reactivity of the epoxy resin composition may easily deteriorate.
  • Preferable catalyst to be used in the process of producing amino composition of present invention includes any substance exhibiting strong basicity.
  • examples of such catalyst include alkaline metal, alkaline metal amide and alkylated alkaline metal.
  • alkaline metal amide by the general formula MNRR′ wherein M is an alkaline metal, N is nitrogen and R and R′ are, each independently, hydrogen or an alkyl group, is preferable and lithium amide (LiNH 2 ) is more preferable.
  • the amount of the catalyst depends on conditions such as species of raw material, reaction proportion and reaction temperature, and is usually 0.05 to 5% by weight and preferably 0.1 to 3% by weight based upon the total weight of raw material. When the amount of catalyst is below 0.05% by weight, the reaction rate may decrease, whereas above 5% by weight, the reaction rate does not increase which is not economical.
  • the reaction temperature is not limited on the condition that it is a melting point of diamine represented by the formula (1) or above. Usually, it is 25 to 150° C. and preferably 50 to 100° C. When the reaction temperature is below 25° C., the reaction rate of diamine represented by the formula (1) and styrene is slow, whereas above 150° C., since a polymer of styrene is produced as a by-product, it is desirable to select the reaction temperature depending on species of raw material, reaction proportion and species and amount of the catalyst.
  • the strong base catalyst such as alkaline metal amide readily reacts with moisture or carbon dioxide in air. Therefore, it is preferable to exclude the influence of moisture and carbon dioxide by carrying out the reaction in an inert gas such as nitrogen, helium or argon.
  • the reaction liquid thus obtained comprises amino compound(s) produced by the reaction and catalyst.
  • the reaction liquid usually further contains unreacted diamine raw material and/or unreacted styrene.
  • alkaline metal amide is used as the catalyst, it is possible to change the alkaline metal amide to a readily removable salt thereof by adding acids such as hydrochloric acid, hydrogen chloride gas and acetic acid, alcohols such as methanol and ethanol or water, and then filtrate it.
  • acids such as hydrochloric acid, hydrogen chloride gas and acetic acid
  • alcohols such as methanol and ethanol or water
  • the amino composition obtained after the reaction is completed and the precipitate such as used catalyst is removed usually contains unreacted diamine represented by the formula (1) as mentioned above.
  • the content of the unreacted diamine is 15% by weight or more, it is desirable to remove the diamine so that the content of the diamine become below 15% by weight, preferably below 5% by weight, more preferably 2% by weight.
  • the removal of the diamine can be carried out by distillation or extraction. Though the method of distillation is not limited, the removal is easily carried out by distillation under reduced pressure.
  • solvent is not limited as long as the diamine is soluble and the group of amino compounds represented by the formula (2) is not solved to the solvent.
  • the preferable solvent is Water.
  • the amino composition of the present invention has reactivity with an epoxy resin or isocyanate and is useful as a curing agent for epoxy resin and a chain extender for polyurethane resin. Particularly, when the amino composition is applied to a curing agent for epoxy resin, it provides a long pot life and an excellent appearance of a coating film to an epoxy resin composition without deteriorating the reactivity of the composition.
  • the curing agent may be used alone or as a mixture with other polyamino curing agents for epoxy resin.
  • the mixing ratio is not limited, it is preferable to select the ratio within limits not losing the characteristic of the amino composition of the present invention.
  • the epoxy resin composition containing the amino composition of the present invention as a curing agent for epoxy resin provides an excellent appearance of coating film and an excellent physical property of cured product. Therefore, it is especially useful as a coating material or a material for civil engineering and construction.
  • epoxy resin used for an epoxy resin composition useful as a coating material or a material for civil engineering and construction preferably include bisphenol A type epoxy resin and bisphenol F type epoxy resin which may be used alone or as a mixture with each other.
  • usable epoxy resin is not limited and any epoxy resin having glycidyl group reactive with active hydrogen of the amino composition of the present invention containing in the curing agent for epoxy resin can be used.
  • the content of the amino composition in an epoxy resin composition is not limited, it is preferable to mix 0.7 to 1.2 active hydrogen equivalent of the amino composition based upon the total epoxy equivalent of epoxy resin. Further, components for modification such as filler and plasticizer, components for adjusting fluidity such as diluent and thixotropic agent, and other ingredients such as pigment, leveling agent, and tackifier may be added to the epoxy resin composition of the present invention depending on the intended use.
  • Evaluation of the property of an epoxy resin composition and a cured product thereof is carried out by the following method.
  • Epoxy resin composition was coated on a glass plate (25 ⁇ 300 ⁇ 2 mm) with thickness of 76 micron under the conditions of 23° C. and 50% RH.
  • the time required to reach each drying stage was measured by RCI drying meter of drying time. The shorter the time required is, the higher the curing property is.
  • Epoxy resin composition was coated on a steel plate with thickness of 200 micron under the conditions of 23° C. and 50% RH. After 7 days of curing, the appearance of coating film such as whitening and stickiness was observed.
  • Epoxy resin composition was coated on a steel plate with thickness of 200 micron under the conditions of 23° C. and 50% RH. Intercoat Adhesion is evaluated with the coating film prepared by coating upper layer 1 day after coating lower layer.
  • the coating film after 1+7 days of curing is evaluated referring to X cut-tape method of JIS K 5400.
  • Coated steel plate after 7 days of curing was dipped in each chemical (sodium hydroxide with the concentration of 10%, sulfuric acid with the concentration of 10%, acetic acid with the concentration of 10%, methanol, and toluene) for 7 days under the condition of 23° C. Change of the appearance of the coating film was evaluated visually. Salt spray test was carried out being compliant with JIS K 5400.
  • An epoxy resin composition was cured for 7 days under the conditions of 23° C. and 50% RH to prepare each test peace.
  • An epoxy resin composition was cured for 7 days under the conditions of 23° C. and 50% RH to prepare each test peace.
  • an epoxy resin composition was cured for 7 days under the conditions of 23° C. and 85% RH to prepare each test peace.
  • 1,3-BAC 1,3-bis(aminomethyl)cyclohexane, manufactured by Mitsubishi Gas Chemical Co., Inc., in Japan
  • 1,3-BAC 1,3-bis(aminomethyl)cyclohexane
  • lithium amide 2.0 g (0.09 mol)
  • a flask similar as the one used in Example of Synthesis 1 was charged to a flask similar as the one used in Example of Synthesis 1, and its interior temperature was raised to 80° C. in a nitrogen gas stream with stirring. Keeping the temperature at 80° C., 364.7 g (3.5 mol) of styrene was added thereto dropwise over 1.5 hours. After the completion of dropwise addition, its interior temperature was maintained to 80° C. for one hour.
  • Epoxy resin compositions were prepared by mixing bisphenol A type liquid epoxy resin with an epoxy equivalent of 190, manufactured by Japan Epoxy Resins Co., Ltd., trade name; Epicoat 828, and amino compositions A to E obtained by Examples of Synthesis 1 to 5 used as a curing agent for epoxy resin at a ratio shown in Table 1.
  • Example 1 Example 2
  • Example 3 Example 4
  • Example 5 Epoxy resin composition (g) Epicoat 828 100 100 100 100 100 100 Amino compound A 48 Amino compound B 55 Amino compound C 42 Amino compound D 51 Amino compound E 59 Pot life (min) 280 340 191 225 290 Curing property (hr:min) set-to-touch 3:45 4:15 3:45 5:15 6:00 dust free 6:45 7:30 6:00 8:30 9:15 dry through 15:15 16:45 20:00 17:30 18:30 Appearance whitening not observed not observed not observed not observed not observed not observed stickiness not observed not observed not observed not observed not observed not observed not observed not observed not observed not observed not observed
  • Example 1 Example 7
  • Example 2 Example 3 Epoxy resin composition (g) Epicoat 828 100 100 100 100 100 100 Amino compound F 44 Amino compound G 75 Amino compound H 45 Amino compound I 76 Amino compound J 42 Pot life (min) 175 — 130 — — Curing property (hr:min) set-to-touch 3:00 6:15 4:15 9:00 4:15 dust free 5:45 10:00 7:15 12:15 6:45 dry through 14:00 >24:00 15:45 >24:00 >24:00 Appearance whitening observed observed not observed not observed not observed stickiness not observed not observed observed observed observed observed observed observed observed observed observed
  • Unreacted MXDA was removed by vacuum distillation from 600 g of amino composition J obtained by the manner described in Example of Synthesis 10, whereby 486.4 g of Amino composition K was obtained.
  • the content of unreacted MXDA in the amino composition K was 0.7% by weight base upon the total weight of the amino composition.
  • the content of addition product wherein R1, R2, and R3 are all hydrogen was 55% by weight based upon the total weight of the group of amino compounds represented by the formula (2).
  • Unreacted 1,3-BAC was removed by vacuum distillation from 600 g of amino composition L obtained by Example of Synthesis 12, whereby 474.8 g of Amino composition M was obtained.
  • the content of unreacted 1,3-BAC in the amino composition M was 0.6% by weight.
  • the content of addition product wherein R1, R2, and R3 are all hydrogen was 55% by weight based upon the total weight of the group of amino compounds represented by the formula (2).
  • Epoxy resin compositions were prepared by mixing bisphenol A type liquid epoxy resin with an epoxy equivalent of 190, manufactured by Japan Epoxy Resins Co., Ltd., trade name; Epicoat 828, and amino compositions K and M obtained by Examples of Synthesis 11 and 13 used as a curing agent for epoxy resin at a ratio shown in Table 3.
  • the epoxy resin compositions thus obtained were cured under the conditions of the temperature of 23° C. and 50% RH to prepare cured coating film and cured product with which evaluation of property was carried out.
  • Example 9 Epoxy resin composition (g) Epicoat 828 100 100 Amino composition K 55 Amino composition M 56 Property of cured coating film Appearance Gloss ⁇ ⁇ Clarity ⁇ ⁇ Leveling ⁇ ⁇ Drying characteristics ⁇ ⁇ Intercoat adhesion ⁇ ⁇ Water resistance ⁇ / ⁇ / ⁇ ⁇ / ⁇ (1/4/7 days) Chemical resistance 10% sodium hydroxide ⁇ ⁇ 10% sulfuric acid ⁇ ⁇ 10% acetic acid ⁇ ⁇ methanol ⁇ ⁇ toluene ⁇ ⁇ solt spray test ⁇ ⁇ Physical property of cured product Tensile strength (Mpa) 36.8 35.3 Tensile modulus (Gpa) 2.31 2.22 Flexural strength (Mpa) 69.4 70.1 Flexural modulus (Gpa) 2.05 2.31 Compressive strength (Mpa) 78.6 79.7 Compressive modulus (Gpa) 2.54 2.56 Adhesion property of cured product Tensile shear adhesion strength (Mpa) 36.
  • amino composition obtained by addition reaction of diamine represented by the formula (1) with styrene wherein the content of unreacted diamine represented by the formula (1) is less than a certain amount and the content of addition product represented by the formula (2) in which R1, R2 and R3 are all hydrogen is in the range of certain amount
  • amino composition obtained by addition reaction of diamine represented by the formula (1) with styrene in a certain range of reaction ratio provides a long pot life and an excellent appearance of a coating film to an epoxy resin composition without deteriorating the reactivity of the composition when it is used as a curing agent for epoxy resin.
  • an epoxy resin composition using a curing agent for epoxy resin comprising an amino composition of the present invention provides an excellent performance of cured coating film of epoxy resin, an excellent physical property of an epoxy resin cured product and an excellent adhesion property of an epoxy resin cured product, and is suitable for use as epoxy resin coating material and use in the field of civil engineering and construction.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Epoxy Resins (AREA)
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Cited By (3)

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US20040171770A1 (en) * 2003-02-13 2004-09-02 Hisayuki Kuwahara Low-temperature curable epoxy resin curing agent and epoxy resin composition
US20080275191A1 (en) * 2007-04-26 2008-11-06 Air Products And Chemicals, Inc. New Amine Composition
US8063157B2 (en) 2004-06-21 2011-11-22 Huntsman Advanced Materials Americas Llc Curing agents for epoxy resins

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US20120142816A1 (en) * 2006-11-20 2012-06-07 Dow Global Technologies Inc Novel epoxy hardeners with improved cure and polymers with enhanced coating properties
US8512594B2 (en) * 2008-08-25 2013-08-20 Air Products And Chemicals, Inc. Curing agent of N,N′-dimethyl-meta-xylylenediamine and multifunctional amin(s)
CN104159946A (zh) * 2012-03-09 2014-11-19 建筑研究和技术有限公司 可胺固化的环氧树脂组合物
WO2013131776A1 (fr) * 2012-03-09 2013-09-12 Construction Research & Technology Gmbh Composition de résine époxyde durcissable par des amines
JP6886641B2 (ja) * 2015-03-31 2021-06-16 三菱瓦斯化学株式会社 エポキシ樹脂硬化剤、エポキシ樹脂組成物、塗料、土木建築用部材、硬化物及び複合材料、並びにエポキシ樹脂硬化剤の製造方法
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